WO2008116078A2 - Stimulation of an immune response by cationic lipids - Google Patents
Stimulation of an immune response by cationic lipids Download PDFInfo
- Publication number
- WO2008116078A2 WO2008116078A2 PCT/US2008/057678 US2008057678W WO2008116078A2 WO 2008116078 A2 WO2008116078 A2 WO 2008116078A2 US 2008057678 W US2008057678 W US 2008057678W WO 2008116078 A2 WO2008116078 A2 WO 2008116078A2
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- WO
- WIPO (PCT)
- Prior art keywords
- antigen
- cationic lipid
- cells
- dotap
- cationic
- Prior art date
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- A61K47/64—Drug-peptide, drug-protein or drug-polyamino acid conjugates, i.e. the modifying agent being a peptide, protein or polyamino acid which is covalently bonded or complexed to a therapeutically active agent
- A61K47/646—Drug-peptide, drug-protein or drug-polyamino acid conjugates, i.e. the modifying agent being a peptide, protein or polyamino acid which is covalently bonded or complexed to a therapeutically active agent the entire peptide or protein drug conjugate elicits an immune response, e.g. conjugate vaccines
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
- A61P37/04—Immunostimulants
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C219/00—Compounds containing amino and esterified hydroxy groups bound to the same carbon skeleton
- C07C219/02—Compounds containing amino and esterified hydroxy groups bound to the same carbon skeleton having esterified hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton
- C07C219/04—Compounds containing amino and esterified hydroxy groups bound to the same carbon skeleton having esterified hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated
- C07C219/06—Compounds containing amino and esterified hydroxy groups bound to the same carbon skeleton having esterified hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having the hydroxy groups esterified by carboxylic acids having the esterifying carboxyl groups bound to hydrogen atoms or to acyclic carbon atoms of an acyclic saturated carbon skeleton
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
- A61K2039/55511—Organic adjuvants
- A61K2039/55555—Liposomes; Vesicles, e.g. nanoparticles; Spheres, e.g. nanospheres; Polymers
Definitions
- the present invention generally relates to stimulating an immune response, and more particularly to the role of lipids in immune responses.
- immunologic modifiers that enhance, direct, or promote an immune response
- vaccines may include antigens to stimulate an immune response.
- some potential vaccines that include antigens are weak stimulators of an immune response because the vaccines do not efficiently deliver the antigen to antigen presenting cells (“APC”) of the immune system and/or the antigen is weakly immunogenic.
- an immunomodifier when included as part of a therapeutic vaccine, should at least (1) improve antigen delivery and/or processing in the APC [Wang, R. F., and Wang, H. Y. Enhancement of antitumor immunity by prolonging antigen presentation on dendritic cells.
- the primary class of agents used to enhance the efficacy of antigens, such as peptide or protein antigens, in eliciting an immune response are adjuvants such as water-in- oil emulsions, alum, and other chemicals which enhance antigen responses; however, these adjuvants are not immunomodifiers, as described above, because they have no direct immunomodulatory effects themselves [Vogel, F. R., and Powell, M. F. A compendium of vaccine adjuvants and excipients, Pharm Biotechnol 6: 141 (1995)].
- adjuvants such as water-in- oil emulsions, alum, and other chemicals which enhance antigen responses; however, these adjuvants are not immunomodifiers, as described above, because they have no direct immunomodulatory effects themselves [Vogel, F. R., and Powell, M. F. A compendium of vaccine adjuvants and excipients, Pharm Biotechnol 6: 141 (1995)].
- influenza virosomes In addition to traditional adjuvants such as the aluminum salts, products such as influenza virosomes [Gluck, R., and Walti, E. 2000. Biophysical validation ofEpaxal Berna, a hepatitis A vaccine adjuvanted with immunopotentiating reconstituted influenza virosomes (IRIV). Dev Biol (Basel) 103:189 (2000)] and Chiron's MF59 [Kahn, J. O., et al.
- a weakly immunogenic antigen can be modified to increase its immunogenicity.
- a weakly immunogenic antigen can be coupled to immunogenic peptides, polysaccharides, or lipids to increase its immunogenicity.
- simply coupling weakly immunogenic antigens to these types of compounds may not be sufficient to elicit an immune response.
- the resulting immune response may be directed to immunogenic epitopes on the coupled compound and not the weak antigen, or the coupled antigen may not be efficiently delivered APC of the immune system.
- additional methods are needed to stimulate immune responses to antigens that are weakly immunogenic.
- This invention is directed to the use of cationic lipids, which under certain dose and composition conditions act as a novel class of immune- stimulants, to (1) effectively present or deliver an antigen to the immune system and (2) stimulate the immune system to respond to the antigen.
- Liposomes have been extensively used for delivering small molecular weight drugs, plasmid DNA, oligonucleotides, proteins, and peptides.
- Vaccines using liposomal vehicles as non-viral antigen carriers are preferable compared to traditional immunizations using live attenuated vaccines or viral vectors such as vaccinia or influenza virus.
- U.S. Patent No. 7,303,881 describes a simple yet effective lipid-based immunotherapy, a cationic lipid/antigen complex, which consists of two molecules, the cationic lipid and an antigen, and to which additional components such as stabilizers, adjuvants and surface modifiers could be added [See U.S. Patent No. 7,303,881].
- the formulation which consists of a cationic lipid, and an antigen [e.g., E7, a human papilloma virus (“HPV”)], induces both preventative and therapeutic anti-tumor immune responses against HPV- positive TC-I tumor in a mouse model.
- an antigen e.g., E7, a human papilloma virus (“HPV)
- HPV human papilloma virus
- one aspect of the invention provides a composition of at least one cationic lipid in a dose sufficient to induce an immune response in a subject by activating MAP kinase signaling by the cells of the immune system of a subject.
- Another aspect of the invention provides a method of inducing an immune response in a subject by activating the MAP kinase signaling pathway by administering a cationic lipid to the subject.
- Another aspect of the invention provides a composition of at least one cationic lipid in a dose sufficient to induce an immune response by inducing the production of reactive oxygen species ("ROS") in the cells of the immune system of the subject.
- the cationic lipid complex stimulates ROS production to levels sufficient to increase the immune response above the immune response present in the absence of the at least one cationic lipid.
- Another aspect of the invention provides a method of inducing immune response by administering to a subject a cationic lipid complex to induce the production of reactive oxygen species (“ROS”) in the cells of the immune system of the subject.
- the cationic lipid complex stimulates ROS production to levels sufficient to increase the immune response above the immune response present in the absence of the at least one cationic lipid.
- Additional aspects of the invention involve the addition of at least one antigen to form a cationic lipid/ antigen complex in which case the immune response is antigen-specific.
- FIG. 1 is a graph depicting in vitro cytokine production after stimulation of dendritic cells with l,2-dioleoyl-3-trimethylammoninum propane (“DOTAP").
- DOTAP l,2-dioleoyl-3-trimethylammoninum propane
- FIG. 2 Analysis of CTL-mediated cytotoxicity by flow cytometry.
- E7-specific cytotoxic T-lymphocyte (“CTL") clones were prepared and expanded. After five days in vitro restimulation with E7 peptide, effector cells were incubated with PKH-67 labeled TC-I target cells at the indicated effecto ⁇ target ratio for 4 h at 37°C.
- Fig. 3 Tumor infiltrating T-lymphocytes were observed in mice that received DOTAP/E7 at the optimal lipid dose.
- TC-I tumors were established as described and were left untreated or treated with a single injection on day 6. Solid tumors were dissected on day 14 and examined for infiltrating lymphocytes.
- FITC conjugated anti-CD8 (A, B, C) and anti- CD4 (D, E, F) antibodies were used to determine tumor infiltrating T cells followed by counterstaining with DAPI.
- Representative tumor sections from groups of 3 mice were examined as described and imaged with confocal microscopy. TUNEL assay was conducted to detect apoptosis in the tumor sections (G, H, I).
- Fig. 4 is a graph depicting induction of humoral activity by treatment with cationic lipid treatment.
- Fig. 5 is a graph illustrating the reduction in the T regulatory cell population in mice after receiving DOTAP with E7 peptide using flow cytometry.
- Fig. 6 Kinetics of TC-I tumor growth in mice treated with DOTAP/E7 formulations.
- mice received treatment of 10 ⁇ g E7 peptide formulated in DOTAP liposomes at various lipid concentrations.
- TC-I tumor size of each group at day 23 was compared to the untreated control group and was analyzed statistically (* p ⁇ 0.05, ** p ⁇ 0.01, *** p ⁇ 0.001).
- Fig. 7 Subcutaneous injection of DOTAP induces dendritic cell activation and migration to the draining lymph node.
- PBS control A, C and E
- DOTAP/E7 DOTAP/E7 containing 100 nmols total lipid with 0.5% NBD-DOTAP
- B, D and F 0.5% NBD-DOTAP
- draining lymph node cells were prepared and stained with appropriate antibodies to surface markers.
- the co-expression of NBD and CDl Ic (A and B) or CD86 (C and D) were analyzed within total lymph node cells whereas the co-expression of NBD and CD8 (E and F) were gated and analyzed within CD3 + population.
- the numbers represent the percentages of cells in the quadrants.
- Fig. 8 shows that immunization with E7 peptide formulated in optimal DOTAP adjuvant elicits functional CD8 + T cells.
- Fig. 9 is a Plot illustrating the anti-tumor immune response of cationic lipid/E7 complexes composed of various cationic lipids compared to potent adjuvants known to elicit a T-cell response
- Fig. 10 is a graph illustrating ROS production in the draining lymph node of mice and correlated with the anti-tumor immune response.
- a Draining lymph nodes (“DLN”) from mice that received injections of DOTAP/E7 containing 0, 15, 100 or 600 nmol lipid were isolated 2 h after the injection. The relative percentages of cells with positive ROS signals are listed.
- B Cytotoxicity in the DLN was measured by collecting cells at 10 h after DOTAP/E7 injection by flow cytometry. The relative percentages of dead cells (PI positive) in DC (open square) and the numbers of live DC per 10 5 LN cells (bars) were shown and compared with that of the untreated control by paired Student's t test (**P ⁇ 0.01).
- C Reactive oxygen species ("ROS”) production in DLN was diminished by co-formulation of an inert neutral lipid, dioleoyl phosphatidylcholine (“DOPC”) with D0TAP/E7 (mole ratio of
- DOPC/ DOTAP 5
- Fig. 11 illustrates the effect of improved encapsulation efficiency on the resulting immune response due to the cationic lipid/ antigen complex.
- Anti TC-I tumor activity was enhanced by incorporation of E7-lipopeptide in the cationic liposomal formulation.
- TC-I tumor bearing mice (8-12 mice per group) received a single treatment on day 6 with DOTAP/E7 (containing
- Fig. 12 is a graph demonstrating that immunization of mice with DOTAP/E7-lipopeptide induces increased secretion of IFN- ⁇ in CD8 + T cells.
- Fig. 13 is a graph illustrating increased immunogenicity of peptide antigen attached to short unrelated amino acid sequence.
- FIG. 14A is a graph illustrating the expression of co-stimulatory molecules, CD80 and CD86, on DC2.4 cells after stimulation with different cationic liposomes.
- FIG. 14B is a graph illustrating the expression of hydrocarbon chain length dependence of cationic lipids on the expression of co- stimulatory molecule (CD 80) on DC
- Fig. 15 Transcription of chemokines and CDlIc are upregulated and IL-I is down regulated by cationic liposomes.
- A Affymetrix microarray analysis showing fold increase in mRNA levels after DC2. Four cells were treated with 50 ⁇ M DOTAP liposomes for 24 h.
- B B
- RT-PCR showing CCL2 and CCL4 are upregulated by DOTAP and 1,2-dioleoyl-sn-glycero-
- DOEPC 3-ethylphosphocholine
- Fig. 17 DOTAP induces CCL2 release in a dose dependent manner
- Fig. 18 MAP Kinase inhibitors were used to study the signaling pathways involved in the DOTAP-induced CCL2 release from BMDC.
- BMDC were pre-incubated with inhibitors for 20 min, followed by 75 ⁇ M DOTAP liposome treatment for 24 h.
- the concentration used in the experiments are: PD (PD-98059), 20 ⁇ M; SB (SB-203580), lO ⁇ M;
- Fig. 19 DOTAP induces activation of ERK and p38 in BMDC.
- A Time course study. On day 6, BMDC were seeded in 12-well plate in the density of 106/mL/well. They were incubated with 75 ⁇ M DOTAP liposomes for the indicated time. The cells were harvested and subjected to Western blotting analysis using antibodies indicated in the figure.
- ERK activation was mainly through PI-3 kinase and negatively regulated by p38.
- ERKl gene expression was blocked by siRNAafter 24 h treatment in BMDC.
- B ERKl blockage by siRNA specifically attenuated
- DOTAP-induced CCL2 release from BMDC DOTAP: 75_M
- DOTAP/E7 formulation induces the accumulation of CCL2 in the mice draining lymph nodes.
- the mice On indicated days, the mice were sacrificed and the draining lymph nodes were collected.
- the draining lymph nodes were either homogenized in lOO ⁇ L ELISA buffer (10%FBSin PBS) and then analyzed by ELISA (A) or immunochemically stained by CCL2 antibody (B) as mentioned in the text.
- Original magnification x400.
- Fig. 22 Inhibition ofERK both attenuates the CCL2 accumulation in the draining lymph nodes and blocks the anti-tumor activity of DOTAP/E7 formulation.
- A CCL2 accumulation in the draining lymph nodes was reciprocally regulated by ERK and p38 pathways.
- Tumor size was measured thereafter. *p ⁇ 0.05, compared to the DOTAP/E7.
- Fig 23 Cationic lipid/ antigen complexes effectively activate human dendritic cells.
- Figures 20, A-E illustrate stimulation of CD 80 by DOTAP/E7, CD 83 by DOTAP/E7, CD
- CD 86 by DOTAP/E7, CD 80 by DOEPC/E7 and DOTAP/Cholesterol/E7, and CD 83 by
- DOEPC/E7 and DOTAP/Cholesterol/E7 respectively.
- Fig. 24 illustrates the ability of DOTAP/E7 complex to induce cytokine and chemokine production by human dendritic cells.
- Figures 23 A-F illustrate production of TNF- ⁇ , IL-12, CCL3, CCL4, CC15, and CCL-19 respectively.
- Fig. 25 illustrates the effect of the cationic lipid/antigen complex particles size on activation of human dendritic cells.
- One aspect of the present invention provides a cationic lipid to produce an immune response in a mammal to prevent or treat disease.
- the cationic lipid can function independently as an immunomodulator, in a dose dependent manner, such as for production of chemokines and/or cytokines, by activating various components of the MAP kinase signaling pathway.
- the optimal dose range is observed to differ within various mammalian species. In the rodent species for example the optimal cationic lipid dose may range between 50 - 300 nmole.
- the specific doses and compositions described herein are merely exemplary and one skilled in the art can determine the doses appropriate for use in a given subject.
- the cationic lipid in a low dose range may be associated with antigens or drugs for presentation to cells of the immune system while simultaneously stimulating a strong antigen- specific immune response.
- the antigen is a lipopeptide.
- U.S. Patent No. 7,303,881 discloses that multiple cationic lipids complexed with disease-associated antigens were shown to stimulate a prophylactic immune response that prevented the specific disease (e.g., HPV-positive cancer) and also a therapeutic immune response that killed cells expressing the particular antigen and resulted in an effective treatment of the disease.
- DOTAP propyl-N,N,N- trimethyl ammonium chloride
- DOTMA propyl-N,N,N- trimethyl ammonium chloride
- cationic lipids can function independently as immunodulators within certain low dose ranges or compositions to stimulate an immune response with (or without) antigens.
- cationic lipids When cationic lipids are complexed with an antigen, an antigen specific immune response is generated.
- the cationic lipid compositions of the present invention administered under certain dose conditions presently described stimulate the induction of various components of the MAP kinase signaling pathway and activate the body's immune response to fighting disease, while concurrently delivering antigens to the cells of the immune system.
- cationic lipids induce the production of reactive oxygen species ("ROS") production in a dose dependent manner.
- ROS reactive oxygen species
- high ROS production induces apoptosis in cells of the immune system dampening the ability of the lipid to generate a strong immune response.
- the production of a specific range of ROS results in the production of cytokines and chemokines to regulate an immune response.
- the optimal dose of cationic lipid is an amount that effectively stimulates levels of ROS production sufficient to stimulate an increase in the immune response above an immune response present in the absence of a cationic lipid (while not stimulating excess ROS production sufficient to induce significant amounts of apoptosis in immune system cells, i.e., enough apoptosis to dampen the immune response) and activates the MAP kinase signaling pathway.
- the optimal dose may vary among species and is easily determined by one having ordinary skill in the art.
- the cationic lipid at optimal dose, is administered in combination with an antigen or antigens.
- the cationic lipid/antigen combination is capable of generating an immune response that is specific to the antigen(s) delivered in combination with the cationic lipid.
- the response generated may include production of specific cytotoxic T cells, memory T cells, or B cells resulting in the prevention of or therapeutic response to the specific disease associated with the antigen(s).
- the cationic lipids of the invention may be in the form of cationic lipid complexes.
- the cationic lipid complex can take the form of various vesicles such as liposomes, micelles, or emulsions.
- the cationic lipid complexes may be unilaminar or multilaminar.
- the antigen may be encapsulated in the cationic lipid complex or may be unencapsulated. Encapsulated is understood to mean that the antigen may be contained within the internal space of the complex and/or incorporated into the lipid walls of the complex.
- the invention further relates to a method for producing these complexes where the method may optionally include the step of purifying these formulations from excess individual components.
- the purification step is an advantageous embodiment.
- cationic lipid complexes have a net positive charge and/or a positively charged surface at pH 6.0-8.0.
- the optional "antigen" which may be included with cationic lipid complexes of the invention may be nucleic acids, peptides, lipopeptides, proteins, lipoproteins, polysaccharides, and other macromolecules which may be complexed directly with cationic lipids.
- cationic drugs e.g., large cationic protein
- anionic lipid or sequentially complexed first with anionic lipid or polymer followed by cationic lipid permits delivery of positive or neutral charged drugs to cells by the complexes of the present invention.
- One aspect of the present invention involves the use of the cationic lipid complexes to stimulate the production of chemokines and cytokines.
- Chemokines and cytokines are important regulators of immune responses. Chemokines were originally identified as potent chemoattractants for inflammatory cells including neutrophils, eosinophils, and monocytes/macrophages. Subsequent studies have revealed that chemokines have profound effects on immune reactions by regulating the trafficking of dendritic cells and other lymphocytes into lymphoid organs. Dendritic cells are migratory cells that sample antigens in the tissue, migrate to the draining lymph nodes and mature to stimulate the T cell response.
- CCL2 cytotoxic T lymphocytes
- IL-12 interleukin-12
- IFN- ⁇ interferon- ⁇
- CC chemokine Another CC chemokine, CCL-4, has also been shown to recruit and expand dendritic cells in vivo and potentiate the immunogenicity of plasmid DNA vaccines. Recently, it has been shown that chemokines enhance immunity by guiding na ⁇ ve CD8+ T cells to sites of CD4+ T cell-dendritic cell interaction and promote memory CD8+ T cell generation.
- chemokines that may be stimulated by the cationic lipid complexes of the present invention are CCL-2, CCL-3, and CCL-4.
- Examples of cytokines that may be stimulated by the cationic lipid complexes of the present invention are IL- 12 and IFN- ⁇ . The inventors contemplate that the cationic lipid complexes of the present invention may stimulate chemokines and cytokines in addition to those disclosed in this specification.
- the cationic lipid complexes of the present invention stimulate an immune response by activating cellular kinase pathways such as, for example, the extracellular-signal-regulated kinase (ERK) pathway (also known as mitogen actived (MAP) kinase pathway), p38 pathway, or phosphatidyl inositol-3 (PI-3) pathway.
- ERK extracellular-signal-regulated kinase
- MAP mitogen actived
- PI-3 phosphatidyl inositol-3
- Cationic lipid complexes of the present invention may regulate T cell activity to stimulate an immune response.
- T cells There are three classes of T cells: helper T cells, killer T cells and regulatory T cells. These three classes of T cells work together to coordinate the cellular immune response.
- the cytotoxic T-lymphocytes (“CTL”) also known as killer T cells or CD8+ T-cells, are responsible for attacking cells that express foreign or tumor antigens.
- CTL cytotoxic T-lymphocytes
- Regulatory T cells are believed to be responsible for dampening CTL mediated immunity, although the exact mechanisms underlying this effect of the regulatory T cells is not well understood. It is known that decreasing regulatory T cell activity can result in increased CTL activity leading to a more robust cellular immunity response.
- the cationic lipid complexes of the present invention at optimal lipid dose compositions may also stimulate a potent immune response by decreasing the population of regulatory T cells.
- the cationic lipid complexes of the present invention may form liposomes that are optionally mixed with antigen and may contain cationic lipids alone or cationic lipids in combination with neutral lipids.
- Suitable cationic lipid species include, but are not limited to: 3-P[ 4 N-( 1 N, 8 -diguanidino spe ⁇ nidine)-carbamoyl] cholesterol (BGSC); 3- ⁇ [N,N- diguanidinoethyl-aminoethane)-carbamoyl] cholesterol (BGTC); N,N 1 N 2 N 3 Tetra- methyltetrapalmitylspermine (cellfectin) ; N-t-butyl-N'-tetradecyl-S-tetradecyl-aminopropion- amidine (CLONfectin); dimethyldioctadecyl ammonium bromide (DDAB); 1,2- dimyristyloxypropyl-3-dimethyl-
- non-steroidal cationic lipids having a structure represented by the following formula:
- R 1 is a quaternary ammonium group
- Y 1 is chosen from a hydrocarbon chain, an ester, a ketone, and a peptide
- R 2 and R 3 are independently chosen from a saturated fatty acid, an unsaturated fatty acid, an ester-linked hydrocarbon, phosphor-diesters, and combinations thereof.
- DOTAP, DMTAP, DSTAP, DPTAP, DPEPC, DSEPC, DMEPC, DLEPC, DOEPC, DMKE, DMKD, DOSPA, DOTMA are examples of lipids having this general structure.
- cationic lipids of the invention are lipids in which bonds between the lipophilic group and the amino group are stable in aqueous solution.
- bonds used in the cationic lipids include amide bonds, ester bonds, ether bonds and carbamoyl bonds.
- liposomes containing more than one cationic lipid species may be used to produce the complexes of the present invention.
- liposomes comprising two cationic lipid species, lysyl- phosphatidylethanolamine and ⁇ -alanyl cholesterol ester have been disclosed for certain drug delivery applications [Brunette, E. et al., Nucl. Acids Res., 20:1151 (1992)].
- the methods of the invention are not restricted only to the use of the cationic lipids recited above but rather, any lipid composition may be used so long as a cationic liposome is produced and the resulting cationic charge density is sufficient to activate and induce an immune response.
- the complexes of the invention may contain other lipids in addition to the cationic lipids.
- lipids include, but are not limited to, lyso lipids of which lysophosphatidylcholine (1-oleoyl lysophosphatidylcholine) is an example, cholesterol, or neutral phospholipids including dioleoyl phosphatidyl ethanolamine (DOPE) or dioleoyl phosphatidylcholine (DOPC) as well as various lipophylic surfactants, containing polyethylene glycol moieties, of which Tween-80 and PEG-PE are examples.
- DOPE dioleoyl phosphatidyl ethanolamine
- DOPC dioleoyl phosphatidylcholine
- various lipophylic surfactants containing polyethylene glycol moieties, of which Tween-80 and PEG-PE are examples.
- the cationic lipid complexes of the invention may also contain negatively charged lipids as well as cationic lipids so long as the net charge of the complexes formed is positive and/or the surface of the complex is positively charged.
- Negatively charged lipids of the invention are those comprising at least one lipid species having a net negative charge at or near physiological pH or combinations of these. Suitable negatively charged lipid species include, but are not limited to, CHEMS (cholesteryl hemisuccinate), NGPE (N-glutaryl phosphatidlylethanolanine), phosphatidyl glycerol and phosphatidic acid or a similar phospholipid analog.
- the cationic lipid is present in the liposome at from about 10 mole % to about 100 mole % of total liposomal lipid, or from about 20 mole % to about 80 mole %.
- the neutral lipid when included in the liposome, may be present at a concentration of from about 0 mole % to about 90 mole % of the total liposomal lipid, or from about 20 mole % to about 80 mole %, or from 40 mole % to 80 mole %.
- the negatively charged lipid when included in the liposome, may be present at a concentration ranging from about 0 mole % to about 49 mole % of the total liposomal lipid, or from about 0 mole % to about 40 mole %.
- the liposomes contain a cationic and a neutral lipid, in ratios between about 2:8 to about 6:4.
- the complexes of the present invention may contain modified lipids, protein, polycations or receptor ligands which function as a targeting factor directing the complex to a particular tissue or cell type.
- targeting factors include, but are not limited to, asialoglycoprotein, insulin, low density lipoprotein (LDL), folate and monoclonal and polyclonal antibodies directed against cell surface molecules.
- LDL low density lipoprotein
- the positive surface charge can be sterically shielded by incorporating lipophilic surfactants which contain polyethylene glycol moieties.
- the cationic lipid complexes may be stored in isotonic sucrose or dextrose solution upon collection from the sucrose gradient or they may be lyophilized and then reconstituted in an isotonic solution prior to use.
- the cationic lipid complexes are stored in solution.
- the stability of the cationic lipid complexes of the present invention is measured by specific assays to determine the physical stability and biological activity of the cationic lipid complexes over time in storage.
- the physical stability of the cationic lipid complexes is measured by determining the diameter and charge of the cationic lipid complexes by methods known to those of ordinary skill in the art, including for example, electron microscopy, gel filtration chromatography or by means of quasi-elastic light scattering using, for example, a Coulter N4SD particle size analyzer as described in the Examples.
- the physical stability of the cationic lipid complex is "substantially unchanged" over storage when the diameter of the stored cationic lipid complexes is not increased by more than 100%, or by not more than 50%, or by not more than 30%, over the diameter of the cationic lipid complexes as determined at the time the cationic lipid complexes were purified.
- the cationic lipid While it is possible for the cationic lipid to be administered in a pure or substantially pure form, it is preferable to present it as a pharmaceutical composition, formulation or preparation.
- Pharmaceutical formulations using the cationic lipid complexes of the invention may comprise the cationic lipid complexes in a physiologically compatible sterile buffer such as, for example, phosphate buffered saline, isotonic saline or low ionic strength buffer such as acetate or Hepes (an exemplary pH being in the range of about 5.0 to about 8.0).
- a physiologically compatible sterile buffer such as, for example, phosphate buffered saline, isotonic saline or low ionic strength buffer such as acetate or Hepes (an exemplary pH being in the range of about 5.0 to about 8.0).
- the cationic lipid complexes may be administered as aerosols or as liquid solutions for intratumoral, intraarterial, intravenous, intratracheal, intraperitoneal, subcutaneous, and intramuscular administration.
- the formulations of the present invention may incorporate any stabilizer known in the art.
- Illustrative stabilizers are cholesterol and other sterols that may help rigidify the liposome bilayer and prevent disintegration or destabilization of the bilayer.
- agents such as polyethylene glycol, poly-, and mono-saccahrides may be incorporated into the liposome to modify the liposome surface and prevent it from being destabilized due to interaction with blood-components.
- illustrative stabilizers are proteins, saccharides, inorganic acids, or organic acids which may be used either on their own or as admixtures.
- a number of pharmaceutical methods may be employed to control, modify, or prolong the duration of immune stimulation. Controlled release preparations may be achieved through the use of polymer complexes such as polyesters, polyamino acids, methylcellulose, polyvinyl, poly (lactic acid), and hydrogels to encapsulate or entrap the cationic lipids and slowly release them. Similar polymers may also be used to adsorb the liposomes. The liposomes may be contained in emulsion formulations in order to alter the release profile of the stimulant.
- the duration of the stimulant's presence in the blood circulation may be enhanced by coating the surface of the liposome with compounds such as polyethylene glycol or other polymers and other substances such as saccharides which are capable of enhancing the circulation time or half life of liposomes and emulsions.
- the cationic lipids may be combined with typical pharmaceutical carriers known in the art such as, for example, sucrose, lactose, methylcellulose, carboxymethyl cellulose, or gum Arabic, among others.
- the cationic lipids may also be encapsulated in capsules or tablets for systemic delivery.
- Administration of the cationic lipid of the present invention may be for either a prophylactic or therapeutic purpose.
- the cationic lipid is provided in advance of any evidence or symptoms of illness.
- the cationic lipid is provided at or after the onset of disease.
- the therapeutic administration of the immune- stimulant serves to attenuate or cure the disease.
- the cationic lipid may be administered with an additional therapeutic agent(s) or antigen(s).
- the prophylactic or therapeutic effect may be generated against a specific disease.
- the formulations of the present invention both for veterinary and for human use, comprise a cationic lipid alone as described above, and also optionally, with one or more therapeutic ingredients such as an antigen(s) or drug molecule(s).
- the formulations may conveniently be presented in unit dosage form and may be prepared by any method known in the pharmaceutical art.
- the cationic lipid is administered without any additional agents in order to boost or lower various immune responses, including production of other immune modulators, and to boost the immune response to fighting disease.
- the cationic lipid is administered in combination with an antigen or antigens.
- the objective is to generate an immune response, which is specific to the antigen(s) delivered in combination with the cationic lipid.
- the response generated may include production of specific cytotoxic T-cells, memory T-cells, or B-cells resulting in the prevention of or therapeutic response to the specific disease associated with those antigen(s).
- the antigen can be any tumor-associated antigen or microbial antigen or any other antigen known to one skilled in the art.
- a "tumor-associated antigen,” as used herein is a molecule or compound (e.g., a protein, peptide, polypeptide, lipoprotein, lipopeptide, glycoprotein, glycopep tides, lipid, glycolipid, carbohydrate, RNA, and/or DNA) associated with a tumor or cancer cell and which is capable of provoking an immune response (humoral and/or cellular) when expressed on the surface of an antigen presenting cell in the context of an MHC molecule.
- Tumor- associated antigens include self antigens, as well as other antigens that may not be specifically associated with a cancer, but nonetheless enhance an immune response to and/or reduce the growth of a tumor or cancer cell when administered to an animal. More specific embodiments are provided herein.
- a "microbial antigen,” as used herein, is an antigen of a microorganism and includes, but is not limited to, infectious virus, infectious bacteria, infectious parasites and infectious fungi.
- Microbial antigens may be intact microorganisms, and natural isolates, fragments, or derivatives thereof, synthetic compounds which are identical to or similar to naturally- occurring microbial antigens and, preferably, induce an immune response specific for the corresponding microorganism (from which the naturally-occurring microbial antigen originated).
- a compound is similar to a naturally-occurring microorganism antigen if it induces an immune response (humoral and/or cellular) similar to a naturally-occurring microorganism antigen.
- a naturally-occurring microorganism antigen is well known to those of ordinary skill in the art such as, for example, a protein, peptide, polypeptide, lipoprotein, lipopeptide, glycoprotein, glycopep tides, lipid, glycolipid, carbohydrate, RNA, and/or DNA.
- a compound that is similar to a naturally-occurring microorganism antigen is a peptide mimic of a polysaccharide antigen. More specific embodiments are provided herein.
- the term "antigen" is further intended to encompass peptide or protein analogs of known or wild-type antigens such as those described in this specification.
- the analogs may be more soluble or more stable than wild type antigen, and may also contain mutations or modifications rendering the antigen more immunologically active.
- Antigen can be modified in any manner, such as adding lipid or sugar moieties, mutating peptide or protein amino acid sequences, mutating the DNA or RNA sequence, or any other modification known to one skilled in the art.
- Antigens can be modified using standard methods known by one skilled in the art.
- compositions and methods of the present invention are peptides or proteins which have amino acid sequences homologous with a desired antigen's amino acid sequence, where the homologous antigen induces an immune response to the respective tumor, microorganism or infected cell.
- the antigen in the cationic lipid complex comprises an antigen associated with a tumor or cancer, i.e., a tumor-associated antigen, to make a vaccine to prevent or treat a tumor.
- the tumor or cancer vaccines of the present invention further comprise at least one epitope of at least one tumor-associated antigen.
- the tumor or cancer vaccines of the present invention further comprise a plurality of epitopes from one or more tumor- associated antigens.
- the tumor-associated antigens finding use in the cationic lipid complexes and methods of the present invention can be inherently immunogenic, or non-immunogenic, or slightly immunogenic.
- tumor-associated self antigens may be advantageously employed in the subject vaccines for therapeutic effect, since the subject compositions are capable of breaking immune tolerance against such antigens.
- exemplary antigens include, but are not limited to, synthetic, recombinant, foreign, or homologous antigens, and antigenic materials may include but are not limited to proteins, peptides, polypeptides, lipoproteins, lipopeptides, lipids, glycolipids, carbohydrates, RNA and DNA.
- Such vaccines include, but are not limited to the treatment or prevention of breast cancer, head and neck cancer, melanoma, cervical cancer, lung cancer, prostate cancer gut carcinoma, or any other cancer known in the art succeptable to immunotherapy, using a cationic lipid in a complex with a tumor-associated antigen(s). It is also possible to formulate the antigen with the cationic lipid without encapsulating in the liposome.
- the cationic lipid complexes of the present invention may be used in methods to treat or prevent cancer. In such a case, the mammal to be immunized is injected with the pharmaceutical formulation containing the liposome with the encapsulated antigen(s).
- Tumor-associated antigens suitable for use in the present invention include both naturally occurring and modified molecules which may be indicative of single tumor type, shared among several types of tumors, and/or exclusively expressed or overexpressed in tumor cells in comparison with normal cells.
- proteins, glycoproteins, lipoproteins, peptides, and lipopeptides tumor-specific patterns of expression of carbohydrates, gangliosides, glycolipids, and mucins have also been documented.
- Exemplary tumor-associated antigens for use in cancer vaccines include protein products of oncogenes, tumor suppressor genes, and other genes with mutations or rearrangements unique to tumor cells, reactivated embryonic gene products, oncofetal antigens, tissue-specific (but not tumor-specific) differentiation antigens, growth factor receptors, cell surface carbohydrate residues, foreign viral proteins, and a number of other self proteins.
- tumor-associated antigens include, e.g., mutated or modified antigens such as the protein products of the Ras p21 protooncogenes, tumor suppressor p53 and HER-2/neu and BCR-abl oncogenes, as well as CDK4, MUMl, Caspase 8, and Beta catenin; overexpressed antigens such as galectin 4, galectin 9, carbonic anhydrase, Aldolase A, PRAME, Her2/neu, ErbB-2 and KSA, oncofetal antigens such as alpha fetoprotein (AFP), human chorionic gonadotropin (hCG); self antigens such as carcinoembryonic antigen (CEA) and melanocyte differentiation antigens such as Mart 1/Melan A, gplOO, gp75, Tyrosinase, TRPl and TRP2; prostate associated antigens such as PSA, PAP, PSMA, PSM-Pl and PSM
- Tumor-associated antigens include whole cell and tumor cell lysates as well as immunogenic portions thereof, as well as immunoglobulin idiotypes expressed on monoclonal proliferations of B lymphocytes for use against B cell lymphomas.
- Tumor-associated antigens and their respective tumor cell targets include, e.g., cytokeratins, particularly cytokeratin 8, 18 and 19, as antigens for carcinoma.
- Epithelial membrane antigen (EMA), human embryonic antigen (HEA-125), human milk fat globules, MBrI, MBr8, Ber-EP4, 17-1A, C26 and T16 are also known carcinoma antigens.
- Desmin and muscle-specific actin are antigens of myogenic sarcomas.
- Placental alkaline phosphatase, beta-human chorionic gonadotropin, and alpha-fetoprotein are antigens of trophoblastic and germ cell tumors.
- Prostate specific antigen is an antigen of prostatic carcinomas, carcinoembryonic antigen of colon adenocarcinomas.
- HMB-45 is an antigen of melanomas.
- useful antigens could be encoded by human papilloma virus.
- Chromagranin-A and synaptophysin are antigens of neuroendocrine and neuroectodermal tumors. Of particular interest are aggressive tumors that form solid tumor masses having necrotic areas.
- the human papillomavirus HPV antigens are used.
- a specific HPV antigen that used as a tumor-associated antigen is HPV subtype 16 E7.
- HPV E7 antigen-cationic lipid complexes are effective at preventing and treating cervical cancer.
- a genetically engineered E7 protein, i.e., E7m protein, having antigenic activity, but without tumorigenic activity is an effective tumor-associated antigen.
- E7m-cationic lipid complexes induce cellular immunity to cause complete regression of established tumors and, thus, are useful as potent anti-cervical cancer vaccines.
- Tumor-associated antigens can be prepared by methods well known in the art.
- these antigens can be prepared from cancer cells either by preparing crude extracts of cancer cells (e.g., as described in Cohen et al., Cancer Res., 54:1055 (1994)), by partially purifying the antigens, by recombinant technology, or by de novo synthesis of known antigens.
- the antigen may also be in the form of a nucleic acid encoding an antigenic peptide in a form suitable for expression in a subject and presentation to the immune system of the immunized subject.
- the antigen may be a complete antigen, or it may be a fragment of a complete antigen comprising at least one epitope.
- Antigens derived from pathogens known to predispose to certain cancers may also be advantageously included in the cancer vaccines of the present invention. It is estimated that close to 16% of the worldwide incidence of cancer can be attributed to infectious pathogens; and a number of common malignancies are characterized by the expression of specific viral gene products. Thus, the inclusion of one or more antigens from pathogens implicated in causing cancer may help broaden the host immune response and enhance the prophylactic or therapeutic effect of the cancer vaccine.
- Pathogens of particular interest for use in the cancer vaccines provided herein include the, hepatitis B virus (hepatocellular carcinoma), hepatitis C virus (heptomas), Epstein Barr virus (EBV) (Burkitt lymphoma, nasopharynx cancer, PTLD in immunosuppressed individuals), HTLVL (adult T cell leukemia), oncogenic human papilloma viruses types 16, 18, 33, 45 (adult cervical cancer), and the bacterium Helicobacter pylori (B cell gastric lymphoma).
- EBV Epstein Barr virus
- HTLVL adult T cell leukemia
- HTLVL adult T cell leukemia
- oncogenic human papilloma viruses types 16, 18, 33, 45 adult cervical cancer
- Helicobacter pylori B cell gastric lymphoma
- the antigen in the cationic lipid complex comprises an antigen derived from or associated with a pathogen, i.e., a microbial antigen.
- the pathogen vaccines of the present invention further comprise at least one epitope of at least one microbial antigen.
- Pathogens that may be targeted by the subject vaccines include, but are not limited to, viruses, bacteria, parasites and fungi.
- the pathogen vaccines of the present invention further comprise a plurality of epitopes from one or more microbial antigens.
- the microbial antigens finding use in the cationic lipid complexes and methods may be inherently immunogenic, or non-immunogenic, or slightly immunogenic.
- Exemplary antigens include, but are not limited to, synthetic, recombinant, foreign, or homologous antigens, and antigenic materials may include but are not limited to proteins, peptides, polypeptides, lipoproteins, lipopeptides, lipids, glycolipids, carbohydrates, RNA, and DNA.
- Exemplary viral pathogens include, but are not limited to, viruses that infect mammals, and more particularly humans.
- Retroviridae e.g., human immunodeficiency viruses, such as HIV-I (also referred to as HTLV-III, LAV or HTLV-III/LAV, or HIV-III; and other isolates, such as HIV-LP; Picornaviridae (e.g. polio viruses, hepatitis A virus; enteroviruses, human Coxsackie viruses, rhinoviruses, echoviruses); Calciviridae (e.g. strains that cause gastroenteritis); Togaviridae (e.g. equine encephalitis viruses, rubella viruses); Flaviridae (e.g.
- Coronoviridae e.g. coronaviruses
- Rhabdoviradae e.g. vesicular stomatitis viruses, rabies viruses
- Coronaviridae e.g. corona viruses
- Rhabdoviridae e.g. vesicular stomatitis viruses, rabies viruses
- Filoviridae e.g. ebola viruses
- Paramyxoviridae e.g. parainfluenza viruses, mumps virus, measles virus, respiratory syncytial virus
- Orthomyxoviridae e.g. influenza viruses
- Bungaviridae e.g.
- African swine fever virus African swine fever virus
- gram negative and gram positive bacteria may be targeted by the subject compositions and methods in vertebrate animals. Such gram positive bacteria include, but are not limited to Pasteurella species, Staphylococci species, and Streptococcus species.
- Gram negative bacteria include, but are not limited to, Escherichia coli, Pseudomonas species, and Salmonella species.
- infectious bacteria include but are not limited to: Helicobacter pylons, Borella burgdorferi, Legionella pneumophilia, Mycobacteria sps (e.g. M. tuberculosis, M. avium, M. intracellular, M. kansaii, M.
- Polypeptides of bacterial pathogens which may find use as sources of microbial antigens in the subject compositions include but are not limited to an iron-regulated outer membrane protein, (“IROMP”), an outer membrane protein (“OMP”), and an A-protein of Aeromonis salmonicida which causes furunculosis, p57 protein of Renibacterium salmoninarum which causes bacterial kidney disease ("BKD"), major surface associated antigen ("msa”), a surface expressed cytotoxin (“mpr”), a surface expressed hemolysin (“ish”), and a flagellar antigen of Yersiniosis; an extracellular protein (“ECP”), an iron- regulated outer membrane protein (“IROMP”), and a structural protein of Pasteurellosis; an OMP and a flagellar protein of Vibrosis anguillarum and V.
- IROMP iron-regulated outer membrane protein
- OMP outer membrane protein
- V an A-protein of Aeromonis salmonicida which causes furun
- antigens can be isolated or prepared recombinantly or by any other means known in the art.
- pathogens further include, but are not limited to, fungi that infect mammals, and more particularly humans.
- fungi include, but are not limited to: Cryptococcus neoformans, Histoplasma capsulatum, Coccidioides immitis, Blastomyces dermatitidis, Chlamydia trachomatis, Candida albicans.
- infectious parasites include Plasmodium such as Plasmodium falciparum, Plasmodium malariae, Plasmodium ovale, and Plasmodium vivax.
- Other infectious organisms i.e. protists
- Polypeptides of a parasitic pathogen include but are not limited to the surface antigens of Ichthyophthirius.
- compositions and methods of the present invention are useful for treating infections of nonhuman mammals.
- Many vaccines for the treatment of non-human mammals are disclosed in Bennett, K. Compendium of Veterinary Products, 3rd ed. North American Compendiums, Inc., 1995; see also WO 02/069369, the disclosure of which is expressly incorporated by reference herein.
- non-human pathogens include, but are not limited to, mouse mammary tumor virus (“MMTV”), Rous sarcoma virus (“RSV”), avian leukemia virus (“ALV”), avian myeloblastosis virus (“AMV”), murine leukemia virus (“MLV”), feline leukemia virus (“FeLV”), murine sarcoma virus (“MSV”), gibbon ape leukemia virus (“GALV”), spleen necrosis virus (“SNV”), reticuloendotheliosis virus (“RV”), simian sarcoma virus (“SSV”), Mason-Pfizer monkey virus (“MPMV”), simian retrovirus type 1 (“SRV-I”), lentiviruses such as HIV-I, HIV-2, SIV, Visna virus, feline immunodeficiency virus (“FIV”), and equine infectious anemia virus (“EIAV”), T-cell leukemia viruses such as
- treatment refers to a prophylactic treatment which increases the resistance of a subject to infection with a pathogen or decreases the likelihood that the subject will become infected with the pathogen; and/or treatment after the subject has become infected in order to fight the infection, e.g., reduce or eliminate the infection or prevent it from becoming worse.
- Microbial antigens can be prepared by methods well known in the art. For example, these antigens can be prepared directly from viral and bacterial cells either by preparing crude extracts, by partially purifying the antigens, or alternatively by recombinant technology or by de novo synthesis of known antigens.
- the antigen may also be in the form of a nucleic acid encoding an antigenic peptide in a form suitable for expression in a subject and presentation to the immune system of the immunized subject. Further, the antigen may be a complete antigen, or it may be a fragment of a complete antigen comprising at least one epitope.
- the antigen may be modified to increase its hydrophobicity or the negative charge on the antigen.
- Hydrophobicity of an antigen may be increased such as, for example, by conjugating to a lipid chain or hydrophobic amino acids in order to improve it's the antigen's solubility in the hydrophobic acyl chains of the cationic lipid, while maintaining the antigenic properties of the molecule.
- the modified antigen can be a lipoprotein, a lipopeptide, a protein or peptide modified with an amino acid sequence having increased hydrophobicity, and combinations thereof.
- the modified antigen may have a linker conjugated between the lipid and the antigen such as, for example, an N-terminal ⁇ or ⁇ -palmitoyl lysine may be connected to antigen via a dipeptide serine-serine linker.
- the DOTAP/E7-lipopeptide complex exhibited an enhanced functional antigen- specific CD8 + T lymphocyte response in vivo compared to the DOTAP/E7 formulation.
- the antigen may be manipulated to increase its negative charge by altering the formulation buffer in which the antigen is encapsulated into the cationic lipid complexes or by covalently attaching anionic moieties such as, for example, anionic amino acids to the antigen.
- Example 1 As demonstrated in Example 1 (below) immunogenicity of the E7 antigen was increased by covalently modifying the antigen. It was possible to covalently attach to the antigen an amino acid sequence such that the resulting antigen amino acid sequence is not found in the parent protein from which the antigen was derived. Studies were performed to demonstrate that the modified antigen provided superior MHC class I binding affinity compared to the native antigen. This superior binding affinity as demonstrated, translated to the generation of a superior in-vivo anti tumor immune response against HPV-positive TC-I tumors. The present invention will be further appreciated in light of the following examples. [0097] Examples [0098] Example 1
- phosphate buffered saline was used in all liposome preparation procedures.
- the E7 antigen was the H-2D b restricted CTL epitope (amino acid 49-57, RAHYNIVTF [SEQ. ID. NO. I]) derived from HPV 16 E7 protein (synthesized by the University of Pittsburgh, Molecular Medicine Institute, Pittsburgh, PA).
- Liposomes used these studies were made using lipid films. Lipid films were made in glass vials by (1) dissolving the lipids in chloroform, and (2) evaporating the chloroform solution under a steady stream of dry nitrogen gas. Traces of organic solvent were removed by keeping the films under vacuum overnight.
- the lipid films were then hydrated for 12 h by adding the required amount of water or buffer to make a final concentration of 10 mg/mL.
- the suspensions were then sonicated in a bath type sonicator for 10 min followed by extrusion through 400, 200 and 100 nm membrane filters (commercially available from Hamilton Co., Reno, NV) and stored at 4°C.
- the lipid film was rehydrated by an aqueous solution of E7 peptide.
- Other methods used in general liposome preparation that are well known to those skilled in the art may also be used.
- DOTAP DOTAP and to further characterize its immuno- stimulatory activity it is important to assess whether DOTAP can induce proper ThI cytokine production to further enhance the immune response.
- BMDC bone marrow derived dendritic cells
- IL-12 and TNF- ⁇ production in supernatant were analyzed by BD ELISA Set. LPD and LPS were used as positive controls.
- the bacterial DNA in LPD contains CpG motifs known to activate the immune system via toll-like-receptors and stimulate TNF- ⁇ .
- Culture supernatant was harvested and IL-12 and TNF- ⁇ cytokine levels were assessed by ELISA.
- IL-12, but not TNF- ⁇ production increased in response to DOTAP concentration. This indicates that, in addition to dendritic cells, other cell types, e.g. T cells, may also be involved in the ThI cytokine production stimulated by DOTAP liposome observed in vivo. Further, the fact that the cationic lipids did not induce significant levels of the pro-inflammatory cytokine TNF- ⁇ , suggests that the immunostimulatory mechanism may be independent of the toll-like-receptor pathway.
- An antigen specific CTL immune response is induced in a lipid dose dependent manner by a cationic lipid/ antigen complex.
- mice were sacrificed and splenocytes were harvested and dissociated.
- TC-I cell line was used as target cells in this assay.
- TC-I cells are C57BL/6 mouse lung epithelial cells transformed with HPV 16 E6 and E7 oncogenes and the activated H-ras.
- TC-I cells were labeled with PKH-67 (commercially available from Sigmaof St. Louis, MO) according to manufacturer's instructions. Effectors and labeled targets were plated into 96- well plates at various effector: target (E:T) ratios and the lysis reactions were carried out for 4 h at 37 0 C. Cells were then harvested and stained with propidium iodide (PI) for analysis on a BD FACSCanto digital flow cytometer (commercially available from BD Biosciences of San Diego, CA). Percentage of E7-specific lysis was determined by the percentage of PI positive cells within the FLl (PKH-67) positive region.
- PI propidium iodide
- mice that received the DOTAP/E7 at 100 nmoles of DOTAP exhibited significant CTL activity resulting in specific killing of TC-I cells while mice that received DOTAP/E7 at 600 nmoles of DOTAP showed a significantly reduced killing effect indicating a cationic lipid dose response effect.
- Mice that received DOTAP/E7 at 15 nmoles of DOTAP did not result in CTL activity that was significantly different from control mice treated with PBS.
- NK cells are able to destroy tumor cells without deliberate immunization or activation and they also play an important role in innate immune responses [Wu, J and Lanier, L L, Natural killer cells and cancer. Adv Cancer Res 90: 127 (2003); and Lodoen, MB, and Lanier, LL, Natural killer cells as an initial defense against pathogens. Curr Opin Immunol 18:391 (2006)].
- Mice that received DOTAP/E7 complex, at various doses of DOTAP exhibited significant killing against YAC-I cells, an NK susceptible target. [00108] 4.
- Administration of a cationic lipid/antigen complex induces in vivo
- T-lymphocytes T-cells
- T-lymphocyes T-lymphocytes
- FIG. 3 C57BL/6 female mice 6-7 weeks old were purchased from Charles River Laboratories (Wilmington, MA) and were used in all animal studies.
- Subcutaneous HPV-positive tumors were established by injecting TC-I cells (10 5 cells) into the hair-trimmed flank of the mouse on day 0.
- Tissue-Tek ® OCT compound commercially available from Sakura Finetek of Torrance, CA
- Samples were cut into 8 ⁇ m thick sections by a cryostat (commercially available from H/I hacker Instruments & Industries Inc.).
- FITC-conjugated anti-CD8 and anti-CD4 antibodies commercially available from Miltenyi Biotec Inc. of Auburn, CA
- DAPI counterstaining nuclei with DAPI
- TUNEL assays were conducted using a TACSTM TdT Kit (commercially available from R&D Systems of Minneapolis, MN) and developed with DAB according to manufacturer's instructions. Samples were imaged with a Nikon Microphot SA microscope.
- a high proportion of CD8+ T lymphocyte (-5%) were found in mice that received DOTAP/E7 at 100 nmole ( Figure 3B) compared to the untreated mice ( Figure 3A) and those that received high dose DOTAP composition (600 nmole, Figure 3C).
- Figures 3E-F The TUNEL assay for determining apoptosis was also performed in some tumor cryosections.
- Figure 4 shows the results of injecting mice with a cationic lipid/antigen complex containing DOTAP and the protein antigen, ovalbumin. Mice were evaluated for the ability of the complex to stimulate B -cell activity and to induce antibody production, also known as the humoral immune response. The humoral response was evaluated by monitoring IgG antibody formation. As illustrated by Figure 4, DOTAP/ovalbumin complexes elicited a humoral response in a dose dependent manner. These data suggest that DOTAP formulations may be used to stimulate both cellular and humoral immune responses. [00115] 6. Administration of a cationic lipid/ antigen complex reduces T- regulatory cell populations in a lipid dose dependent manner.
- DOTAP/E7 in a therapeutic vaccine formulation at its optimal dose to break the immune tolerance maintained by T regulatory cells in tumor-bearing mice, thus enhancing the T-cell immunity to tumor associated antigens.
- All anti-mouse antibodies used for flow cytometry analysis were purchased from and are commercially available from BD Pharmingen (San Diego, CA) or eBioscience, Inc. (San Diego, CA). Spleen cells were harvested and dissociated by using 1 mg/ml collagenase and a 70 ⁇ m cell strainer.
- mice were washed two more times in Perm/WashTM buffer and then finally resuspended in 300 ⁇ l stain buffer and analyzed on a BD FACSCanto digital flow cytometer (commercially available from BD Biosciences of San Diego, CA).
- spleen cells harvested from mice that received DOTAP/E7 complex 100 nmole DOTAP
- the high dosage 600 nmole DOTAP
- animals exhibited lower amounts of T-reg cell subpopulations (Foxp3+, CD25+ and CD25+/Foxp3+) compared to untreated tumor-bearing mice.
- CD4+ T cells significantly increased in spleen cells after mice received optimal DOTAP/E7 treatment, a similar increase was also found in CD8+ T cells (data not shown).
- significant decreases of T-reg populations CD4+/Foxp3+ and CD4+/CD25+/Foxp3+ were found in this treatment group. It was especially evident that the reduced anti-tumor activity of DOTAP/E7 at high DOTAP dose was associated with increased T-reg cell population. A dose response effect of the cationic lipid is again observed.
- cationic lipid composition used in the immunotherapy at an optimal dose of lipid is able to possibly enhance the observed immune response to the specific cancer by breaking tolerance in tumor-bearing mice and to stimulate proliferation of functional CD4+ and CD8+ antigen- specific T lymphocytes while suppressing the T-reg cell population.
- Table 1 Percentage of Treg subpopulation in spleen cells in tumor-bearing mice after the treatment with DOTAP/E7 complex CD4+ CD4+/Foxp3+ CD4+/CD25+/Foxp3+
- DOTAP/E7 compositions at varying doses of DOTAP.
- mice were subcutaneously injected with TC-I cells on day 0 in order to induce the growth of HPV-positive tumors.
- the mice received DOTAP/E7 compositions containing 10 ⁇ g E7 peptide subcutaneously on the opposite side of the abdomen on day 6.
- DOTAP lipid concentration in the complex varied from 3 to 600 nmole (3, 15, 30, 75, 150, 300, and 600 nmole).
- Low dose of DOTAP (15 nmole) showed partial tumor inhibition effect (P ⁇ 0.05) compared to the untreated control on day 23, while DOTAP at 30, 150 or 300 nmol exhibited an enhanced efficacy (P ⁇ 0.01).
- DOTAP at 75 nmol showed the most significant tumor regression effect (P ⁇ 0.001).
- mice given a high dose of DOTAP did not show anti-tumor activity, confirming that DOTAP liposomes at a high dose might have induced a negative regulation to the immune response.
- DOTAP liposomes at the 100 nmole dose, but without E7 peptide did not show significant inhibition of tumor growth, indicating that the anti-tumor effect was antigen specific.
- DOTAP/E7 complex is taken up mainly by dendritic cells after injection and induces dendritic cell activation and migration to the draining lymph node.
- DOTAP/E7 containing 100 nmols total lipid with 0.5% l-Oleoyl-2-[6-[(7-nitro-2-l,3- benzoxadiazol-4-yl)amino]hexanoyl]-3-trimethylammonium propane] ("NBD-DOTAP") ( Figure 7 B, D, and F).
- NBD-DOTAP l-Oleoyl-2-[6-[(7-nitro-2-l,3- benzoxadiazol-4-yl)amino]hexanoyl]-3-trimethylammonium propane]
- NBD-DOTAP l-Oleoyl-2-[6-[(7-nitro-2-l,3- benzoxadiazol-4-yl)amino]hexanoyl]-3-trimethylammonium propane]
- the numbers represented the percentages of cells in the quadrants. Draining lymph node cells were harvested and analyzed by flow cytometry at different time points post injection. The numbers of CDl Ic + cells among total lymph node cells increased by more than 2.5-fold compared to untreated mice 4 h after NBD-DOTAP/E7 injection ( Figure 7 A and B). The expression of the costimulatory molecule, CD86 on the NBD + cells was investigated and NBD + cells demonstrated high levels of CD86 ( Figure 7 C and D), indicating that suncutaneous injection of DOTAP induced dendritic cell activation. NBD uptake by other cell types such as T lymphocytes was also investigated by costaining with anti-CD3, CD4 and CD8 antibodies.
- CD3 + cells were gated and analyzed in ( Figure 7 E and F) and showed no NBD uptake after NBD-DOTAP injection.
- IFN- ⁇ secreted by activated T cells or NK cells are known to play important roles in ThI type immune response as well as inducing CTL response.
- spleen cells from control or immunized mice were isolated at one week after the final immunization and incubated with 5 ⁇ g/ml E7 peptide or without peptide for 6 h followed by intracellular staining of IFN- ⁇ . As depicted in Fig.
- E7 peptide formulated liposomes comprised of (1) cationic lipid (DOTAP, DOEPC and DOTMA), at the 100 nmoledose composition of cationic lipid, (2) anionic lipid (DOPG), or (3) adjuvants (complete Freund adjuvant ("CFA") or CpG ODN1826).
- DOTAP cationic lipid
- DOEPC DOEPC
- DOTMA anionic lipid
- CFA complete Freund adjuvant
- CpG ODN1826 complete Freund adjuvant
- mice that received the anionic lipid DOPG/E7 did not show tumor regression.
- Mice receiving optimal DOTAP/E7 and DOEPC formulations exhibited a better anti-cancer activity (p ⁇ 0.01) compared to those receiving CpG/E7 or CFA/E7 formulations.
- Mice receiving optimal D0TMA/E7 also exhibited a better anti-cancer activity compared to those receiving CpG/E7 or CFA/E7 formulations.
- Cationic lipids induce ROS production in a dose dependent manner, resulting in dendritic cell death and reduced immunostimulatory effect at high doses
- PA-E7 Palmitic RAHYNIVTF [SEQ. ID. NO. 1] 84.5 ⁇ 6.4
- TC-I tumor bearing mice (8-12 per group) were given a single-dose treatment on day 6 (after establishment of the tumor) with DOTAP/E7 (containing 10 nmol or 5 nmol peptide) or DOTAP/E7-lipopeptide formulations (containing 5 nmol of peptide antigen). Compositions of 100 nmole of cationic lipid were used in each case. DOTAP/E7 with 5 nmol of peptide did not show a significant anti-tumor activity.
- both of the E7 -lipopeptides ( ⁇ or ⁇ position) at 5 nmol of antigen when formulated in DOTAP liposomes, showed a significant enhanced therapeutic effect (**p ⁇ 0.01) compared to DOTAP with the native E7 antigen at 5 nmol ( Figure 11).
- the anti-tumor activity elicited by the lipopeptides was similar to that of DOTAP/E7 with 10 nmol.
- PA-E7 which is a palmitoylated E7 peptide (without KSS spacer), when formulated in DOTAP liposome failed to show an enhanced anti-tumor activity as seen in other lipopeptide formulations, likely owing to the epitope being hidden by directly attaching a fatty acid to the peptide.
- Anti tumor activity is enhanced with DOTAP/E7-lipopeptide due, at least in part, to increased encapsulation efficiency of the antigen. This demonstrates that by increasing the hyrdophobicity of the antigen, incorporation into the complex is increased resulting in an increased antigen- specific immune response. Mice treated with dextrose (5 %) were used as a negative control.
- IFN- ⁇ producing CD8 + T cells were analyzed. Spleen cells from control or immunized mice were isolated at one week after the final immunization and were stimulated with 5 ⁇ g/ml E7 peptide or without peptide followed by intracellular staining for IFN- ⁇ .
- Antigenicity of the peptide antigen is improved by the attachment of a short amino acid sequence unrelated to sequences existing in the parent peptide sequence, leading to improved anti-tumor efficacy of a lipid/antigen complex consisting of DOTAP and KSS-E7 peptide
- Antigen encapsulation efficiency was analyzed by filtering the particles over a
- Ionic interactions are minimized in high ionic strength environment. Higher strength ionic environments effectively decrease the negativeBy increasing the ionic strength of the formulation buffer (150 mM NaCl), ionic interactions between the negatively charged antigen and the positively charged lipid were minimized resulting in reduced encapsulation. By reducing ionic strength, ionic interactions between the lipid and antigen were enhanced leading to greater incorporation of the antigen into the complex. Incorporation efficiency into the cationic lipid/ antigen complex can therefore be enhanced by manipulating the antigen to increase the negative charge by altering the formulation buffer or by attaching an anionic or poly-anionic compound to the antigen. [00146] DISCUSSION
- a broad class of cationic lipids can act as potent immunostimulators together with an antigen to generate antigen specific immune responses in the treatment of disease.
- U.S. Patent 7,303,881 discloses that liposomes comprised of cationic lipids activate dendritic cells as demonstrated by the stimulation by cationic lipids of the expression of costimulatory molecules CD80/CD86 on DC2.4 dendritic cells ( Figure 14A and 14B). As shown in FIG. 14A, the ability to stimulate the expression of CD80/CD86 on DC2.4 cells by different cationic liposomes varies greatly.
- Lipofectamine.RTM. a 3:1 (w/w) liposome formulation of the polycationic lipid 2,3- dioleyloxy-N-[2(sperminecarboxamido)ethyl]-N,N-dimethyl-l-propanamini- um trifluoroacetate (DOSPA) and the neutral lipid dioleoyl phosphatidylethanolamine (DOPE), and liposomes prepared from O,O'-dimyristyl-N-lysyl aspartate (DMKE) and O,O'- dimyristyl-N-lysyl-glutamate (DMKD), strongly stimulated the expression of CD80/CD86 by CD2.4 cells.
- DOSPA polycationic lipid 2,3- dioleyloxy-N-[2(sperminecarboxamido)ethyl]-N,N-dimethyl-l-propanamini- um trifluoroacetate
- DOPE neutral lipid dioleoyl
- DC 2.4 cells varied. Both hydrophilic head and the lipophilic tail of the lipids have significant effect on this ability.
- the DXEPC lipids with the ethyl phosphocholine (EPC) head groups appear, in general, to be more potent than the DXTAP lipids with trimethylammonium propane (TAP) head group.
- EPC ethyl phosphocholine
- DLEPC-12:0 l,2-dimyristoyl-sn-glycero-3-ethylphosphocholine
- cationic lipids are not only efficient targeting and delivery vehicles for antigens to APC of the immune system, but also function as potent adjuvants under low dose composition ranges to directly influence immune system function through activation of MAP kinase dependent signaling pathways with resultant production of immune system regulatory molecules including cytokines and chemokines.
- a clear dose-response effect of cationic lipid on the immunostimulatory capabilities of the formulations have been demonstrated.
- an antigen such as, for example, a peptide epitope of E7 protein of the HPV type 16
- DOTAP DOTMA
- DOEPC DOEPC
- the antigen/lipid complex is administrated at about 100 nmole dose compositions by a single subcutaneous injection, it induces regression of the HPV 16 E7-positive tumor, TC-I, in mice.
- the particles were mainly taken up by dendritic cells, the major professional antigen presenting cells.
- the initiation of dendritic cell activation and migration to the draining lymph node facilitates immune responses against antigen specific TC-I tumors as demonstrated.
- Functional CD8 + T lymphocytes were generated in mice upon receiving a DOTAP/E7 injection and tumor sizes decreased and exhibited enhanced apoptosis, owing to the increasing number of infiltrating T cells in the tumor microenvironment.
- the resulting bell-shaped (activity decreases above and below the optimal dose) cationic lipid dose response curve demonstrates activity at very low doses, indicating that the activity of the cationic lipids as adjuvants or immunostimulators is so potent that the EC 50 is as low as about 15 nmol per injection. High doses of cationic lipids eliminate the immunostimulatory activity.
- T regulatory cells were initially described by Gershon et al. [Eardley, D D, et al., Immunoregulatory circuits among T-cell sets. I. T-helper cells induce other T-cell sets to exert feedback inhibition.
- T-reg cell population increases in the peripheral blood of cancer patients [Sasada, T, et al., CD4+CD25+ regulatory T cells in patients with gastrointestinal malignancies: possible involvement of regulatory T cells in disease progression. Cancer 98:1089 (2003)]. They are also enriched among the tumor infiltrating lymphocytes and in the draining lymph nodes [Baecher-Allan, C, and Hafler, DA, Suppressor T cells in human diseases. J Exp Med 200:273 (2004)]. Also, accumulation of T-reg in tumor-associated tissue predicts poor prognosis or survival [Baecher-Allan, C, and Anderson, DE Immune regulation in tumor- bearing hosts. Curr Opin Immunol 18:214 (2006)].
- Cationic lipids therefore constitute a novel class of immune- stimulators that at specific doses can be applied effectively in modulating the body's immune response and in the development of therapeutic agents and vaccines for both prophylactic and therapeutic use.
- Montanide ISATM 51 and 720 from SEPPIC, Inc. which is a mixture of a surfactant from the mannide monooleate family with a mineral oil or nonmineral oil, respectively, have been tested in vaccines for infectious diseases and cancer in humans [Aucouturier, J, et al., Montanide ISA 720 and 51: a new generation of water in oil emulsions as adjuvants for human vaccines. Expert Rev Vaccines 1:111 (2002)].
- ISA 720 is composed of metabolizable oil and is supposed to be less reactogenic in humans.
- the surfactant in the emulsion may trigger toll-like receptors (TLR) on dendritic cells and macrophages thus inducing the production of NF- ⁇ B and inflammatory responses
- TLR toll-like receptors
- cationic liposomes could belong to a unique class of adjuvant with an improved safety profile.
- the DOTAP/E7-lipopeptide complex When the antigen was administered at a reduced dose (5 nmol or less) to tumor bearing mice, the DOTAP/E7-lipopeptide complex exhibited a superior anti-tumor activity compared to the original DOTAP/E7 formulation at a full dose (10 nmol).
- the enhanced antigenicity and anti-tumor activity of the lipopeptide was correlated with the enhanced encapsulation of the lipopeptide in the liposomes. As shown in Table 2, the entrapment efficiency of lipopeptide was 90% at a peptide loading of 2.5 mol% total lipid, whereas only about 25% of the native water soluble E7 peptide only got incorporated into the complex.
- the cationic lipid also acts as a potent immunostimulator leading to a strong antigen- specific immune response resulting in the observed tumor cell death.
- the decreased amount of activated APC in the DLN should definitely play an important role in the observed decrease in the lymphocyte infiltration (Fig. 3), antigen-specific CTL activities and IFN- ⁇ production (Figs. 2 and 8) and, most importantly, the anti-tumor activity (Fig. 6) at the high vaccine dose.
- a desirable level of ROS production is required since DOTAP-induced ROS is probably the initial signal to mediate the subsequent signal transduction, such as the ERK and p38 MAP kinases, necessary for vaccine activity as discussed below in Example 2.
- Fig. 1OC we have demonstrated the importance of the density of the cationic charge to the immunostimulatory effect and resulting anti-cancer activity in Fig. 1OC.
- both ROS generation and anticancer activity can be diminished by co- formulating high ratios of an inert, neutral lipid, DOPC with the cationic lipid/E7 complex, resulting in a decrease of the cationic charge density.
- Example 1 demonstrates the importance of the cationic lipid dose in the immunostimulatory effect and also highlights the role of cationic lipid/antigen complexes in the development of simple and safe immunotherapies to generate strong antigen-specific immune responses for the treatment of cancer and multiple diseases such as bacterial and viral infections.
- TC-I cells were provided by TC Wu (Johns Hopkins University, Baltimore,
- MD C57BL/6 mouse lung endothelial cells that have been transformed with the HPVl 6 E6 and E7 oncogenes and activated H-ras.
- Cells were grown in RPMI medium (commercially available from Invitrogen of Carlsbad, CA) supplemented with 10% fetal bovine serum and 100 U/ml penicillin, and 100 mg/ml streptomycin.
- the MHC class I restricted peptide from the HPV 16 E7 protein (amino acid 49 to 57, RAHYNIVTF [SEQ. ID. NO. I]) was synthesized by the University of Pittsburgh Peptide Synthesis Facility by solid state synthesis using an Advanced ChemTech model 200 peptide synthesizer and purified by HPLC.
- Mouse monoclonal antibodies specific to pERK and ERK2 and siRNA were purchased from Santa Cruz Biotechnology, Inc. of Santa Cruz, CA.
- Rabbit polyclonal antibody specific to phosphorylated p38 (p-p38) was obtained from Cell Signaling Technology Inc. of Danvers, MA.
- GeneChip Mouse Genome 430 2.0 Array was obtained from Affymetrix, Inc.
- PD- 98059, U-0126, PP2, wortmannin, and GF109203X were obtained from Calbiochem.
- Pertussis toxin and other reagents were obtained from Sigma.
- the lipid dispersion was sequentially extruded through polycarbonate membranes with pore size of 0.4, 0.2 and 0.1 ⁇ m. The un-entrapped peptide was not removed. The liposomes were stored at 4 0 C until use. E7 peptide association with the liposome was determined by measuring the percentage of liposome- bound peptide. In brief, unbound E7 peptide from DOTAP/E7 or DOTAP/E7/drug (MAP kinase inhibitor) complexes was separated by a Microcon ® centrifugal filtrate devices (Millipore, Bedford, MA) and the concentration of unbound peptide was measured by Micro BCATM Protein Assay Kit (Pierce, Rockford, ILO. The efficiency of peptide association was determined as percent unbound peptide. Approximately 30% of E7 peptide was associated with the liposomes.
- fragmentation buffer 5X fragmentation buffer: 20OmM Tris-acetate, pH8.1, 50OmM KOAc, 15OmM MgOAc
- ⁇ g of fragmented cRNA was then added to a hybridization cocktail (0.05 ⁇ g/ ⁇ l fragmented cRNA, 50 pM control oligonucleotide B2, BioB, BioC, BioD, and ere hybridization controls, 0.1 mg/ml herring sperm DNA, 0.5 mg/ml acetylated BSA, 10OmM MES, IM NaCl, 2OmM EDTA, 0.01% Tween 20). Ten ⁇ g of cRNA was used for hybridization. Arrays were hybridized for 16 h at 45°C in the GeneChip Hybridization Oven 640.
- the arrays were washed and stained with R-phycoerythrin streptavidin in the GeneChip Fluidics Station 400. After this, the arrays were scanned with the Hewlett Packard GeneArray Scanner. Affymetrix GeneChip Microarray Suite 5.0 software was used for washing, scanning, and basic analysis. Sample quality was assessed by examination of 3' to 5' intensity ratios of certain genes.
- BMDC bone marrow-derived dendritic cells
- BMDC were generated using a procedure modified from that described in
- RNA was isolated from BMDC by Rneasy Mini Kit from Qiagen according to the manufacturer's instruction. Following digestion with Dnase for 30 min at 37 0 C, the total RNA concentration was determined by spectrophotometry.
- Primer pairs for mouse CCL2, CCL3, CCL4 and ⁇ -actin forward primer 5'- AAGCCAGCTCTCTCTTCCTC -3' [SEQ. ID. NO. 3] and reverse primer 5'- CCTCTCTTTGAGCTTGGTG -3' [SEQ. ID. NO. 4] for CCL2; forward primer 5'- ATCATGAAGGTCTCCACCAC -3' [SEQ. ID. NO.
- ⁇ -actin for ⁇ -actin [Wang H., et al., Potential involvement of monocyte chemoattractant protein (MCP)-l/CCh2 in IL-4-mediated tumor immunity through inducing dendritic cell migration into the draining lymph nodes, Int Immunopharmacol 3:627-42, (2003)] were synthesized by IDT technology.
- RT-PCR was performed using the one-step RT-PCR kit (commercially available from Invitrogen of Carlsbad, CA) where reverse transcription and DNA amplification occur in the same reaction. Briefly, 1 ⁇ g of total RNA was used as a template in a reaction that included the appropriate primers in the presence of both reverse transcriptase and Taq polymerase.
- PCR products were visualized by UV transillumination of 1.5% agarose gels stained with ethidium bromide.
- CCL2 ELISA kit commercially available from BD Biosciences.
- BMDC from C57BL/6 mice were cultured for six days in the presence of recombinant mGM-CSF and mIL-4 as described.
- BMDC (10 6 cells in 1 mL/well) were stimulated with medium control or liposomes for 1 h, 24 h or 48 h at 37 0 C.
- the inhibitors were pre-incubated with BMDC for 20 min before liposome stimulation.
- the CCL2 production in supernatant was analyzed by CCL2 ELISA kit.
- the draining lymph nodes of mice were removed at day 2, embedded in OCT compound, snap frozen in liquid nitrogen, and stored at -80 0 C until used for immunohistochemical analysis.
- the goat ABC Staining System (commercially available from Santa Cruz Biotechnology Inc. of Santa Cruz, CA) was used according to the manufacturer's protocol. Briefly, 8 ⁇ m thick crystostat sections of draining lymph nodes were cut and fixed in cold acetone for 10 min and washed in PBS 3 times for 5 min each wash.
- BMDC cell lysate was collected after different treatments and total cellular protein was resolved on polyacrylamide/SDS gels and then transferred to polyvinylidene difluoride membranes.
- the membranes were blocked with 5% nonfat milk in Tris -buffered saline for 1 h and then incubated from 1 h to overnight with primary antibody. After washing the membranes with Tris-buffered saline three times, the membranes were incubated horseradish peroxidase conjugated secondary antibody for 1 h.
- the peroxidase activity associated with the protein bands was detected by enhanced chemiluminescence using ECL plus (Amershan International) followed by autoradiography.
- ECL plus Amershan International
- RNA interference experiments were performed with siRNA for ERKl and control siRNA (commercially available from Santa Cruz Biotechnology of Santa Cruz, CA) using Lipofectamine 2000 reagent (commercially available from Invitrogen of Carlsbad, CA), according to the manufacturer's instructions. Briefly, on day 5, BMDC were seeded at 5 X 10 5 per well in 12 well plates and transfected immediately with 80 nM siRNA using 4 ⁇ l transfection reagent. The cells were incubated with DOTAP or LPS for another 16 h. The supernatant was analyzed by ELISA for CCL2. [00180] B. RESULTS
- a transformed dendritic cell line, DC2.4 which has been shown to be a good model for APC [Mendoza L., et al., Prophylactic, therapeutic and anti-metastatic effects of BMDC and DC lines in mice carrying HPV 16-associated tumours, Int J Oncol 23:243-7, (2003); Okada N., et al., Effects of lipofectin-antigen complexes on major histocompatibility complex class I-restricted antigen presentation pathway in murine dendriticcells and on dendritic cell maturation, Biochim Biophys Acta 1527:97-101, (2001)], was used to study global gene regulation induced by DOTAP by using the Affymetrix microarray analysis (Figure 15A).
- DOTAP induced overexpression of several chemokines, including monocyte chemoattractant protein- 1 ("MCP-I”) / CC chemokine-2 (“CCL2”), macrophage inflammatory protein-1 alpha (“MIP-l ⁇ ”)/CC chemokine-3 (“CCL3”), macrophage inflammatory protein-1 beta (MIP- l ⁇ )/CC chemokine-4 (“CCL4").
- MCP-I monocyte chemoattractant protein- 1
- CCL2 CC chemokine-2
- MIP-l ⁇ macrophage inflammatory protein-1 alpha
- CCL3 macrophage inflammatory protein-3
- MIP- l ⁇ macrophage inflammatory protein-1 beta
- CCL4 IL-I receptor antagonist
- chemokine mRNA was confirmed by RT-PCR with murine BMDC ( Figure 15B).
- chemokines are involved in lymphocyte migration and play important roles in the immune response. Chemokine induction may explain the major adjuvant activity of cationic liposomes as mentioned previously. This hypothesis prompted us to further study the detailed mechanisms underlying the process. Liposomes prepared from different lipids were utilized to determine if the induction of chemokines is a general phenomenon by liposomes.
- DOTAP/E7 liposome complexes DOTAP/E7/U-0126 and DOTAP/E7/SB203580 formed clear suspensions but PD98059 was difficult to formulate in the DOTAP/E7 complex.
- the stable DOTAP/E7/drug formulations had similar zeta potentials, particle sizes and antigen loading capacities as the DOTAP/E7 formulation, indicating that drug incorporation did not significantly alter the physical characteristics of the vaccine.
- Mice were subcutaneously injected with DOTAP/E7/U-0126 and DOTAP/E7/SB203580.
- DOTAP/E7 formulation induced accumulation of CCL2 in the draining lymph nodes and U-0126 and SB-203580 reciprocally regulated CCL2 induction (Figure 22A).
- ERK and p38 pathways are related to the anti- tumor activity of D0TAP/E7
- Figure 22B tumor-bearing mice treated with DOTAP/E7 at the lipid dose of 100 nmoles exhibited a strong growth inhibitory effect on growth of TC-I tumor.
- Liposomes are closed vesicle structures consisting of bilayers of hydrated amphipathic lipids [Small D. M., Surface and bulk interactions of lipids and water with a classification of biologically active lipids based on these interactions, Federation Proc. 29:1320-1326, (1970)]. Since they were identified as adjuvants in 1974 [Allison A.G. and Gregoriadis G., Liposomes as immunological adjuvants, Nature 252: 252, (1974)], liposomes have been extensively explored as a delivery system for protein and DNA vaccines [Chen W.C.
- Liposomes show several unique advantages for antigen delivery. Firstly, there is significant versatility in lipid composition, size, lamellarity, charge, and methods of preparation, which can be chosen for specific applications.
- the liposomal vesicle system has high efficiency of antigen loading in the form of encapsulation or stable association.
- liposomes are biodegradable, biocompatible and have a low immunogenicity [Copland MJ. , et al., Lipid bases particulate formulations for the delivery of antigen, Immunol Cell Biol 83:97-105, (2005); O'Hagan D. T. and Singh M., Microparticles as vaccine adjuvants and delivery systems, Expert Rev Vaccines 2:269-83, (2003)].
- liposomes have also been used to introduce protein antigens into the cytosolic MHC class I pathway to generate CD8+ T cell responses [Chikh G. and Schutze-Redelmeier M.P., Liposomal delivery of CTL epitopes to dendritic cells, Biosci Rep 22:339-53, (2002)].
- cationic liposomes can interact with the negatively charged cell membrane, they are widely used for gene therapy and vaccine delivery [Anderson P., Effective vaccination of mice against Mycobacterium tuberculosis infection with a soluble mixture of secreted mycobacterial proteins, Infect Immun 62:2536-44, (1994); Hasegawa A.,et al., Nasal immunization with diphtheria toxoid conjugated-CD52 core peptide induced specific antibody production in genital tract of female mice, Am J Reprod Immunol 34:305- 11, (2002)].
- cationic liposomes themselves have been regarded as being inert in terms of being able to activate innate immune responses [Moinegeon P., et al., Towards the rational design of ThI adjuvants, Vaccine 19:4363-72, (2001)].
- cationic liposomes can also induce expression of the co-stimulatory molecules CD80 and CD83 and activate human dendritic cells (Fig. 23A-E and 25A-B). They also induce human dendritic cells to produce critical chemokines and cytokines involved with generating a potent immune response to disease (Fig. 24A-F).
- the cationic lipid immunomodulators do not enhance the expression of NF- ⁇ B, demonstrating that immune system stimulation by cationic lipids is signaled through an NF- ⁇ B independent mechanism, eliminating the probability of LPS-like inflammatory responses from our cationic lipid based therapies.
- lysophosphatidycholine induces G2A receptor-dependent ERK activation and T cell migration [Radu C.G., et al., T cell chemotaxis to lysophosphatidylcholine through the G2A receptor, Proc Natl Acad Sci U S A 101:245-50, (2004)].
- LPC was a ligand of G2A receptor [Kabarowski J.H., et al., Lysophosphatidylcholine as a ligand for the immunoregulatory receptor G2A, Science 293:702-5, (2001)], but subsequently, LPC-induced ERK activation was demonstrated through the mechanism of regulating intracellular sequestration and surface expression of G2A receptors [Wang L, et al., Lysophosphatidylcholine-induced surface redistribution regulates signaling of the murine G protein-coupled receptor G2A, MoI Biol Cell 16:2234-47, (2005)].
- the active cationic lipids contain a large polar head group and two long acyl chains. Such structural characteristics may facilitate their insertion into the lipid membranes, resulting in the possible alteration of spontaneous curvature of the lipid monolayer, as well as the conformational and functional changes of membrane proteins.
- SB203580 Since p38 negatively regulates ERK activation of CCL2 induction, we expected the p38 inhibitor, SB203580, formulated in DOTAP/E7 vaccine could enhance the anti-tumor activity. However, an opposite result was found implying that p38 may also play a positive role in the DOTAP/E7-induced tumor regression.
- MAP kinases In mammalian species, MAP kinases (ERK, p38 and JNK) are involved in all aspects of the immune response, from the initiation phase of innate immunity, to the activation of the adaptive immunity, and to cell death when immune function is complete [Dong C, et al., MAP kinases in the immune response, Annu Rev Immunol 20:55-72, (2002)].
- the submicron emulsion based adjuvant, MF59 is internalized by dendritic cells [Dupuis, M., et al., Dendritic cells internalize vaccine adjuvant after intramuscular injection. Cell Immunol 186:18 (1998)]. It stimulates a variety of immune activities that lead to high antibody and T-cell reactions against co-delivered antigens.
- HSV and influenza vaccines Jones, C. A., and Cunningham, A. L., Vaccination strategies to prevent genital herpes and neonatal herpes simplex virus (HSV) disease.
- the cationic lipid/ antigen complex appears to be the simplest cancer vaccine formulation ever reported. It only contains two molecules, i.e. an antigen and a carrier.
- DOTAP In addition to the delivery of the E7 peptide to the cytoplasm of the antigen presenting cells such as, for example, the dendritic cells, DOTAP must also activate DC. Indeed, liposomes consisting of DOTAP alone induce the expression of CD80/CD86 co-stimulatory molecules in dendritic cells.
- cationic liposomes are potent immune system stimulators.
- the results reported herein shed light on the molecular mechanisms of the adjuvant activity of cationic lipids such as, for example, DOTAP.
- DOTAP mediates the induction of several chemokines and cytokines whose expression is mediated by the ERK pathway.
- Our studies also identified the ERK pathway as a new molecular marker for the evaluation of the adjuvant activity of cationic liposomes. These markers may be used for high-throughput screening or design of potent lipid based adjuvants and vaccine delivery systems.
- Cationic lipid/E7 complexes activate human dendritic cells in a lipid dose dependent manner
- Cationic liposomes were prepared as described above.
- the E7 antigen used in the formulation is the identified human E7 peptide restricted by HLA-A*0201 (HPV-16 E7, amino acids 11-20, YMLDLQPETT (SEQ. ID. NO. 2).
- the peptide was synthesized by the
- Human HLA-A2 human dendritic cells were obtained from Lonza (of Walkersville, MD). Frozen cryo vials were thawed and the dendritic cells were cultured in LGM-3 medium (commercially available from Lonza of Walkersville, MD) supplemented with 50 microgram/ml IL-4 and
- GM-CSF at 37 0 C and 5% CO 2 at an initial plating density of 125,000 cells/cm 2 in 2 ml of medium in 12-well tissue culture dishes.
- the cells were grown for 3 days in culture and appeared as a mixture of adherent and rounded cells by microscopic examination.
- the cells were treated on day 3 with a fresh dose of 50 microgram/ml of IL-4 and GM-CSF (all wells) and test wells were treated with either a mixture of interleukin 1-beta
- IL- ⁇ interleukin 6
- TNF- ⁇ interleukin 6
- PGE-2 prostaglandin E2
- DOTAP/E7 at 2.5, 10 and 40 micromolar final concentrations
- DOEPC at 2.5, 10 and 40 micromolar final concentrations
- DOTAP/cholesterol/E7 at 2.5, 10 and 40 micromolar final concentrations of lipid and cholesterol.
- Cholesterol a stabilizer of the lipid bilayer, was added at 25 mol%. The treated dendritic cells were maintained in culture for 24 hours and harvested for cell surface marker staining and flow cytometry analysis.
- the harvested cells were counted by hemacytometer and 10 ⁇ l of the following antibody conjugates were added sequentially to each sample for labeling surface markers: CD80-FITC, CD83-APC, and CD86-PE (BD Biosciences).
- the surface labeled cells were subsequently analyzed by flow cytometry using a BD FACxcaliber flow cytometer, and the co-stimulatory dendritic cell marker molecules CD80, CD83, and CD86 which are produced upon activation, were monitored.
- Cationic lipid/ E7 complexes activate human dendritic cells and induce chemokine and cytokine production
- Human HLA-A2 dendritic cells (Lonza, Walkersville, MD), were treated and grown in culture as described above. On day 3 the cells were treated with 40 micromolar DOTAP/E7 complex or the potent immunostimulator lipopolysaccharide (LPS) at 50 micromolar concentrations (positive control). Medium from assay wells was removed and centrifuged at 1300 rpm in a microfuge for 5 minutes to pellet unattached dendritic cells. The supernants were removed and treated with 10 microliters per ml of Calbiochem (La Jolla,
- FIG. 24 illustrates that the DOTAP/E7 complex induces cytokine and chemokine production by human dendritic cells.
- Figures 24 A-F illustrates DOTAP/E7 induced production of TNF- ⁇ , IL- 12, CCL3, CCL4, CC15, and CCL- 19 respectively.
- DOTAP/E7 did not induce significant production of the proinflammatory cytokine TNF- ⁇ , confirming that in the human system also NF- ⁇ B mediated signaling is not activated by the cationic lipids.
- DOTAP/E7 stimulates effective production of multiple chemokines demonstrating that the cationic lipids act as potent immune stimulators, and provide similar correlates of efficient activation in both murine and human immune cells.
- BMDC murine bone marrow derived dendritic cells
- DOTAP liposomes within specific dose ranges acts as both an antigen carrier and a potent adjuvant for inducing migration of the activated dendritic cells to the draining lymph node, thereby leading to the generation of in vivo antigen-specific CD8 + T lymphocyte against antigen-bearing cells such as tumor cells.
- the cationic lipids are potent immunostimulators, promoting dendritic cell activation toward expression of co- stimulatory molecules which are required for T-cell recognition and antigen presentation.
- human dendritic cells upon activation by DOTAP/E7 liposomes, promote significant proliferation of human T-cells in vitro.
- the studies reported above identify specific unique compositions and applications of cationic liposomes, which can be exploited to develop simple, cost effective, and much needed immunotherapies for several debilitating diseases.
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JP6211383B2 (en) | 2017-10-11 |
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AU2008228798B2 (en) | 2014-05-15 |
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EP2125011B1 (en) | 2015-11-11 |
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US11911359B2 (en) | 2024-02-27 |
US8877206B2 (en) | 2014-11-04 |
US20220031650A1 (en) | 2022-02-03 |
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